use anyhow::bail;
use dt_common::error::Error;
use dt_common::meta::redis::{
    redis_entry::RedisEntry,
    redis_object::{
        HashObject, ListObject, ModuleObject, RedisCmd, SetObject, StringObject, ZsetObject,
    },
};

const CRC64_TABLE: [u64; 256] = [
    0x0000000000000000,
    0x7ad870c830358979,
    0xf5b0e190606b12f2,
    0x8f689158505e9b8b,
    0xc038e5739841b68f,
    0xbae095bba8743ff6,
    0x358804e3f82aa47d,
    0x4f50742bc81f2d04,
    0xab28ecb46814fe75,
    0xd1f09c7c5821770c,
    0x5e980d24087fec87,
    0x24407dec384a65fe,
    0x6b1009c7f05548fa,
    0x11c8790fc060c183,
    0x9ea0e857903e5a08,
    0xe478989fa00bd371,
    0x7d08ff3b88be6f81,
    0x07d08ff3b88be6f8,
    0x88b81eabe8d57d73,
    0xf2606e63d8e0f40a,
    0xbd301a4810ffd90e,
    0xc7e86a8020ca5077,
    0x4880fbd87094cbfc,
    0x32588b1040a14285,
    0xd620138fe0aa91f4,
    0xacf86347d09f188d,
    0x2390f21f80c18306,
    0x594882d7b0f40a7f,
    0x1618f6fc78eb277b,
    0x6cc0863448deae02,
    0xe3a8176c18803589,
    0x997067a428b5bcf0,
    0xfa11fe77117cdf02,
    0x80c98ebf2149567b,
    0x0fa11fe77117cdf0,
    0x75796f2f41224489,
    0x3a291b04893d698d,
    0x40f16bccb908e0f4,
    0xcf99fa94e9567b7f,
    0xb5418a5cd963f206,
    0x513912c379682177,
    0x2be1620b495da80e,
    0xa489f35319033385,
    0xde51839b2936bafc,
    0x9101f7b0e12997f8,
    0xebd98778d11c1e81,
    0x64b116208142850a,
    0x1e6966e8b1770c73,
    0x8719014c99c2b083,
    0xfdc17184a9f739fa,
    0x72a9e0dcf9a9a271,
    0x08719014c99c2b08,
    0x4721e43f0183060c,
    0x3df994f731b68f75,
    0xb29105af61e814fe,
    0xc849756751dd9d87,
    0x2c31edf8f1d64ef6,
    0x56e99d30c1e3c78f,
    0xd9810c6891bd5c04,
    0xa3597ca0a188d57d,
    0xec09088b6997f879,
    0x96d1784359a27100,
    0x19b9e91b09fcea8b,
    0x636199d339c963f2,
    0xdf7adabd7a6e2d6f,
    0xa5a2aa754a5ba416,
    0x2aca3b2d1a053f9d,
    0x50124be52a30b6e4,
    0x1f423fcee22f9be0,
    0x659a4f06d21a1299,
    0xeaf2de5e82448912,
    0x902aae96b271006b,
    0x74523609127ad31a,
    0x0e8a46c1224f5a63,
    0x81e2d7997211c1e8,
    0xfb3aa75142244891,
    0xb46ad37a8a3b6595,
    0xceb2a3b2ba0eecec,
    0x41da32eaea507767,
    0x3b024222da65fe1e,
    0xa2722586f2d042ee,
    0xd8aa554ec2e5cb97,
    0x57c2c41692bb501c,
    0x2d1ab4dea28ed965,
    0x624ac0f56a91f461,
    0x1892b03d5aa47d18,
    0x97fa21650afae693,
    0xed2251ad3acf6fea,
    0x095ac9329ac4bc9b,
    0x7382b9faaaf135e2,
    0xfcea28a2faafae69,
    0x8632586aca9a2710,
    0xc9622c4102850a14,
    0xb3ba5c8932b0836d,
    0x3cd2cdd162ee18e6,
    0x460abd1952db919f,
    0x256b24ca6b12f26d,
    0x5fb354025b277b14,
    0xd0dbc55a0b79e09f,
    0xaa03b5923b4c69e6,
    0xe553c1b9f35344e2,
    0x9f8bb171c366cd9b,
    0x10e3202993385610,
    0x6a3b50e1a30ddf69,
    0x8e43c87e03060c18,
    0xf49bb8b633338561,
    0x7bf329ee636d1eea,
    0x012b592653589793,
    0x4e7b2d0d9b47ba97,
    0x34a35dc5ab7233ee,
    0xbbcbcc9dfb2ca865,
    0xc113bc55cb19211c,
    0x5863dbf1e3ac9dec,
    0x22bbab39d3991495,
    0xadd33a6183c78f1e,
    0xd70b4aa9b3f20667,
    0x985b3e827bed2b63,
    0xe2834e4a4bd8a21a,
    0x6debdf121b863991,
    0x1733afda2bb3b0e8,
    0xf34b37458bb86399,
    0x8993478dbb8deae0,
    0x06fbd6d5ebd3716b,
    0x7c23a61ddbe6f812,
    0x3373d23613f9d516,
    0x49aba2fe23cc5c6f,
    0xc6c333a67392c7e4,
    0xbc1b436e43a74e9d,
    0x95ac9329ac4bc9b5,
    0xef74e3e19c7e40cc,
    0x601c72b9cc20db47,
    0x1ac40271fc15523e,
    0x5594765a340a7f3a,
    0x2f4c0692043ff643,
    0xa02497ca54616dc8,
    0xdafce7026454e4b1,
    0x3e847f9dc45f37c0,
    0x445c0f55f46abeb9,
    0xcb349e0da4342532,
    0xb1eceec59401ac4b,
    0xfebc9aee5c1e814f,
    0x8464ea266c2b0836,
    0x0b0c7b7e3c7593bd,
    0x71d40bb60c401ac4,
    0xe8a46c1224f5a634,
    0x927c1cda14c02f4d,
    0x1d148d82449eb4c6,
    0x67ccfd4a74ab3dbf,
    0x289c8961bcb410bb,
    0x5244f9a98c8199c2,
    0xdd2c68f1dcdf0249,
    0xa7f41839ecea8b30,
    0x438c80a64ce15841,
    0x3954f06e7cd4d138,
    0xb63c61362c8a4ab3,
    0xcce411fe1cbfc3ca,
    0x83b465d5d4a0eece,
    0xf96c151de49567b7,
    0x76048445b4cbfc3c,
    0x0cdcf48d84fe7545,
    0x6fbd6d5ebd3716b7,
    0x15651d968d029fce,
    0x9a0d8ccedd5c0445,
    0xe0d5fc06ed698d3c,
    0xaf85882d2576a038,
    0xd55df8e515432941,
    0x5a3569bd451db2ca,
    0x20ed197575283bb3,
    0xc49581ead523e8c2,
    0xbe4df122e51661bb,
    0x3125607ab548fa30,
    0x4bfd10b2857d7349,
    0x04ad64994d625e4d,
    0x7e7514517d57d734,
    0xf11d85092d094cbf,
    0x8bc5f5c11d3cc5c6,
    0x12b5926535897936,
    0x686de2ad05bcf04f,
    0xe70573f555e26bc4,
    0x9ddd033d65d7e2bd,
    0xd28d7716adc8cfb9,
    0xa85507de9dfd46c0,
    0x273d9686cda3dd4b,
    0x5de5e64efd965432,
    0xb99d7ed15d9d8743,
    0xc3450e196da80e3a,
    0x4c2d9f413df695b1,
    0x36f5ef890dc31cc8,
    0x79a59ba2c5dc31cc,
    0x037deb6af5e9b8b5,
    0x8c157a32a5b7233e,
    0xf6cd0afa9582aa47,
    0x4ad64994d625e4da,
    0x300e395ce6106da3,
    0xbf66a804b64ef628,
    0xc5bed8cc867b7f51,
    0x8aeeace74e645255,
    0xf036dc2f7e51db2c,
    0x7f5e4d772e0f40a7,
    0x05863dbf1e3ac9de,
    0xe1fea520be311aaf,
    0x9b26d5e88e0493d6,
    0x144e44b0de5a085d,
    0x6e963478ee6f8124,
    0x21c640532670ac20,
    0x5b1e309b16452559,
    0xd476a1c3461bbed2,
    0xaeaed10b762e37ab,
    0x37deb6af5e9b8b5b,
    0x4d06c6676eae0222,
    0xc26e573f3ef099a9,
    0xb8b627f70ec510d0,
    0xf7e653dcc6da3dd4,
    0x8d3e2314f6efb4ad,
    0x0256b24ca6b12f26,
    0x788ec2849684a65f,
    0x9cf65a1b368f752e,
    0xe62e2ad306bafc57,
    0x6946bb8b56e467dc,
    0x139ecb4366d1eea5,
    0x5ccebf68aecec3a1,
    0x2616cfa09efb4ad8,
    0xa97e5ef8cea5d153,
    0xd3a62e30fe90582a,
    0xb0c7b7e3c7593bd8,
    0xca1fc72bf76cb2a1,
    0x45775673a732292a,
    0x3faf26bb9707a053,
    0x70ff52905f188d57,
    0x0a2722586f2d042e,
    0x854fb3003f739fa5,
    0xff97c3c80f4616dc,
    0x1bef5b57af4dc5ad,
    0x61372b9f9f784cd4,
    0xee5fbac7cf26d75f,
    0x9487ca0fff135e26,
    0xdbd7be24370c7322,
    0xa10fceec0739fa5b,
    0x2e675fb4576761d0,
    0x54bf2f7c6752e8a9,
    0xcdcf48d84fe75459,
    0xb71738107fd2dd20,
    0x387fa9482f8c46ab,
    0x42a7d9801fb9cfd2,
    0x0df7adabd7a6e2d6,
    0x772fdd63e7936baf,
    0xf8474c3bb7cdf024,
    0x829f3cf387f8795d,
    0x66e7a46c27f3aa2c,
    0x1c3fd4a417c62355,
    0x935745fc4798b8de,
    0xe98f353477ad31a7,
    0xa6df411fbfb21ca3,
    0xdc0731d78f8795da,
    0x536fa08fdfd90e51,
    0x29b7d047efec8728,
];

pub struct EntryRewriter {}

impl EntryRewriter {
    pub fn rewrite_hash(obj: &mut HashObject) -> anyhow::Result<Vec<RedisCmd>> {
        let mut cmds = vec![];
        for (k, v) in &obj.value {
            let mut cmd = RedisCmd::new();
            cmd.add_str_arg("hset");
            cmd.add_redis_arg(&obj.key);
            cmd.add_redis_arg(k);
            cmd.add_redis_arg(v);
            cmds.push(cmd);
        }
        Ok(cmds)
    }

    pub fn rewrite_list(obj: &mut ListObject) -> anyhow::Result<Vec<RedisCmd>> {
        let mut cmds = vec![];
        for ele in &obj.elements {
            let mut cmd = RedisCmd::new();
            cmd.add_str_arg("rpush");
            cmd.add_redis_arg(&obj.key);
            cmd.add_redis_arg(ele);
            cmds.push(cmd);
        }
        Ok(cmds)
    }

    pub fn rewrite_module(_obj: &mut ModuleObject) -> anyhow::Result<Vec<RedisCmd>> {
        bail! {Error::RedisRdbError(
            "module rewrite not implemented".into(),
        )}
    }

    pub fn rewrite_set(obj: &mut SetObject) -> anyhow::Result<Vec<RedisCmd>> {
        let mut cmds = vec![];
        for ele in &obj.elements {
            let mut cmd = RedisCmd::new();
            cmd.add_str_arg("sadd");
            cmd.add_redis_arg(&obj.key);
            cmd.add_redis_arg(ele);
            cmds.push(cmd);
        }
        Ok(cmds)
    }

    pub fn rewrite_string(obj: &mut StringObject) -> anyhow::Result<Vec<RedisCmd>> {
        let mut cmd = RedisCmd::new();
        cmd.add_str_arg("set");
        cmd.add_redis_arg(&obj.key);
        cmd.add_redis_arg(&obj.value);
        Ok(vec![cmd])
    }

    pub fn rewrite_zset(obj: &mut ZsetObject) -> anyhow::Result<Vec<RedisCmd>> {
        let mut cmds = vec![];
        for ele in obj.elements.iter() {
            let mut cmd = RedisCmd::new();
            cmd.add_str_arg("zadd");
            cmd.add_redis_arg(&obj.key);
            cmd.add_redis_arg(&ele.score);
            cmd.add_redis_arg(&ele.member);
            cmds.push(cmd);
        }
        Ok(cmds)
    }

    pub fn rewrite_as_restore(entry: &RedisEntry, version: f32) -> anyhow::Result<RedisCmd> {
        let value = Self::create_value_dump(entry.value_type_byte, &entry.raw_bytes);
        let mut cmd = RedisCmd::new();
        cmd.add_str_arg("restore");
        cmd.add_redis_arg(&entry.key);
        cmd.add_str_arg(&entry.expire_ms.to_string());
        cmd.add_arg(value);
        if version >= 3.0 {
            cmd.add_str_arg("replace");
        }
        Ok(cmd)
    }

    pub fn rewrite_expire(entry: &RedisEntry) -> anyhow::Result<Option<RedisCmd>> {
        if entry.expire_ms == 0 {
            return Ok(None);
        }
        let mut cmd = RedisCmd::new();
        cmd.add_str_arg("pexpire");
        cmd.add_redis_arg(&entry.key);
        cmd.add_str_arg(&entry.expire_ms.to_string());
        Ok(Some(cmd))
    }

    fn create_value_dump(type_byte: u8, val: &[u8]) -> Vec<u8> {
        let mut buf: Vec<u8> = Vec::new();
        buf.push(type_byte);
        buf.extend_from_slice(val);
        buf.extend_from_slice(&6u16.to_le_bytes());
        let sum64 = Self::calc_crc64(&buf);
        buf.extend_from_slice(&sum64.to_le_bytes());
        buf
    }

    fn calc_crc64(p: &[u8]) -> u64 {
        let mut crc: u64 = 0;
        for b in p {
            let inx = (crc as u8) ^ *b;
            crc = CRC64_TABLE[inx as usize] ^ (crc >> 8);
        }
        crc
    }
}
